/Engine/Source/Runtime/Core/Public/Containers/BitArray.h
Adds multiple bits read from the given BitArray.
The index of the first added bit.
template<typename OtherAllocator> int32 AddRange ( const [TBitArray](API\Runtime\Core\Containers\TBitArray)< OtherAllocator > & ReadBits, int32 NumBitsToAdd, int32 ReadOffsetBits )